121221007 has 4 divisors (see below), whose sum is σ = 127601080. Its totient is φ = 114840936.

The previous prime is 121220993. The next prime is 121221013. The reversal of 121221007 is 700122121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 700122121 = 347 ⋅2017643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3190008 + ... + 3190045.

It is an arithmetic number, because the mean of its divisors is an integer number (31900270).

Almost surely, 2^121221007 is an apocalyptic number.

121221007 is a deficient number, since it is larger than the sum of its proper divisors (6380073).

121221007 is an equidigital number, since it uses as much as digits as its factorization.

121221007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6380072.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 121221007 is about 11010.0411897504. The cubic root of 121221007 is about 494.9096961410.

Adding to 121221007 its reverse (700122121), we get a palindrome (821343128).

The spelling of 121221007 in words is "one hundred twenty-one million, two hundred twenty-one thousand, seven".